Conveyor system having a conveyor belt

Abstract

The invention relates to a conveyor system, comprising a conveyor belt, which has a carrying-side cover plate (3) and a running-side cover plate (4), and comprising drums, supporting rollers, and supporting frames, wherein the conveyor system forms a material-conveying upper run having a feed point for the conveying material and a mostly material-free lower run. For a further sufficient flame-inhibiting effect that does not negatively affect the further physical properties of the conveyor belt and that does not pose a health hazard to persons, animals, or the environment, the carrying-side (carrying side) cover plate (3) and/or the running-side (running side) cover plate (4) contains at least one flameproofing agent, wherein the flameproofing agent is free of bromium and bromium compounds.

Claims

1. A conveyor system comprising: a conveyor belt comprising a first outer sheet disposed on a loadbearing side and a second outer sheet disposed on a drive side; a plurality of drums; a plurality of loadbearing rollers; and, a plurality of supportive structures; wherein the conveyor system forms a material-conveying upper web with an application site for material to be conveyed; wherein the conveyor system forms a substantially material-free lower web; wherein one or more of the first outer sheet on the loadbearing side, or the second outer sheet on the drive side, comprises at least a first flame retardant and a second flame retardant; wherein the first one flame retardant is zinc hydroxystannate, zinc hydroxystannate, or a combination of zinc hydroxystannate and zinc stannate; wherein the second flame retardant comprises antimony, an antimony compound, or a combination of antimony and an antimony compound, provided the second flame retardant is an antimony-trioxide-free flame retardant; and, wherein the first flame retardant and the second flame retardant are free from bromine and bromine compounds.

2. The conveyor system as claimed in claim 1, wherein the second flame retardant is incorporated in an amount of from 0 to 5 phr.

Description

(1) The invention will now be explained by using a FIGURE and by using inventive examples with reference to comparative and inventive examples and to a diagram.

(2) Tables 1a to 1c collate the comparative examples and inventive examples. The I mixture here is a mixture of the invention, while the C mixtures are comparative mixtures. The a table here presents the compositions of the mixtures, while the b and c tables illustrate the corresponding physical properties associated therewith and the behavior in the event of a fire. The flame test was carried out by a method based on DIN ISO 4589, and behavior in the event of a fire was evaluated subjectively.

(3) Quantities stated in all of the mixture examples in the table are parts by weight based on 100 parts by weight of total rubber content (phr).

(4) The mixture was produced under conventional conditions with the aid of a laboratory roll mill. Test samples were produced by vulcanization from all of the mixtures, and these test samples were used to determine properties typical for the rubber industry. The tests described above were carried out on test samples by the following test methods: tensile strength at room temperature in accordance with DIN 53 504 Shore A hardness at room temperature in accordance with DIN 53 505 elongation at break at room temperature in accordance with DIN 53 504 abrasion at room temperature in accordance with DIN/ISO 4649

(5) TABLE-US-00001 TABLE 1a Constituents Unit C1 C2 I1 CR/BR phr 100 100 100 Fillers.sup.a phr 10-90 10-90 10-90 Plasticizers.sup.p phr 0-50 0-50 0-50 Antimony trioxide phr 0-25 0-25 0-25 ZHS phr 0 0 5-30 DecaBDE.sup.c phr 0 1-20 0 Additional substances.sup.d phr 5-50 5-50 5-50 Vulcanization system phr 0.5-5 0.5-5 0.5-5 .sup.acarbonates, oxides, hydroxides, silicates, carbon blacks, .sup.be.g. chloroparaffins, .sup.cdecabromodiphenyl ether, .sup.dstearic acid, titanium dioxide, waxes, antiozonant, etc.

(6) TABLE-US-00002 TABLE 1b Property Unit C1 C2 I1 Hardness Shore A 58 61 60 Abrasion mm.sup.3 111 139 140 Tensile strength MPa 15 13 15 Elongation at break % 592 550 550

(7) TABLE-US-00003 TABLE 1c Property Unit C1 C2 I1 LOI (ISO 4589) % 33 37 38 Drip behavior None None None Afterflame time sec. 14 2 0 Reignition (after 60 sec no no no plus hot-air blower)

(8) FIG. 1 shows a conveyor system 1 with a conveyor belt 2 comprising an outer sheet 3 on the loadbearing side for the material to be conveyed and an outer sheet 4 on the drive side made respectively of a polymeric material with resilient properties, for example of a vulcanized rubber mixture based on BR, CR or SBR, and also with an embedded tension-member system, for example in the form of steel cords. The outer sheet 4 on the drive side has contact with a drum 5, which can be the drive drum or reversal drum, and moreover has support within the upper web A and lower web B from supportive rollers 6 in the form of a supportive-roller system. The direction of the arrow shows the direction of running of the conveyor belt 2.

LIST OF REFERENCE SIGNS

(9) (Part of the Description)

(10) 1 Conveyor system 2 Conveyor belt 3 Outer sheet on loadbearing side 4 Outer sheet on drive side 5 Drum (drive drum, reversal drum) 6 Supportive rollers A Upper web B Lower web